Louisiana Department of Environmental Quality Risk Evaluation/Corrective Action Program (RECAP)

Aquifer Tests

Appendix F n Current Use –1-mile radius water well survey –500-feet radius walking receptor survey n Potential Use –Maximum sustainable well yield »Direct Measurement »Estimated Measurement –Total Dissolved Solids (TDS) of groundwater »EPA Standard Method 160.1

NOTE: CLASS 1A - Currently supplies a public water supply. CLASS 2A - Currently supplies a domestic, agricultural, or other supply. Figure 3

Determine Site Constraints n Soil Type n Thickness of Encountered Formations n Identification of Aquifers and Water Levels n Aquitards Encountered n Hydraulic Barriers

Determine Aquifer Properties n Hydraulic Conductivity (K) n Saturated Thickness (b) n Transmissivity (T) n Specific Yield (Sy) n Specific Storage (Ss) n Storativity (S) n Porosity (n)

Unconfined Aquifer Saturated Zone Unsaturated Zone

Confined Aquifer Confining Layer Saturated Zone Confining Layer Unsaturated Zone

Direct Measurement of Aquifer Properties n PUMPING TESTS Constant RateConstant Rate Step-drawdownStep-drawdown n SLUG TESTS Slug InSlug In Slug OutSlug Out

SLUG TESTS Water Flow Slug In Saturated Zone Unsaturated Zone

SLUG TESTS Water Flow Slug Out Saturated Zone Unsaturated Zone

Conceptual Pumping Test Models

Conceptual Slug Test Models

Estimation of Aquifer Properties n HYDRAULIC CONDUCTIVITY Published ReferencesPublished References Laboratory ProceduresLaboratory Procedures Field ProceduresField Procedures n AQUIFER THICKNESS USGS, LGS, DNR, DOTDUSGS, LGS, DNR, DOTD n SPECIFIC YIELD/SPECIFIC STORAGE Published ReferencesPublished References

Estimated Well Yield for Confined Aquifer

Estimated Well Yield for Unconfined Aquifer